Errors during device Modification(EG42) -

I have a PTCT device & an AMI device. I did techinal install(EG33) for PTCT device followed by a full installation for AMI device(EG31). In the back ground I see that AMI device got allocated to PTCT device also. My AMI device

AMI which has 2 registers

Now, when I am doing some device modif (EG42) for change something and press on ‘SAVE’, i am getting an error “Device XXXX, register 001: No transformer allocation exists“.

1) Why am I getting this? My PTCT winding group is also well defined with Voltage(14400 /120) & Current 5,1 for Primary & Secondary respectively.

2) Device allocations are no longer consistent? – I goto EG72 and see that the allocations are also fine.